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The majority of the time this turns out to be the high pressure oil pump.
Are you prepared to do the testing or are you just wanting ideas on what it may be or what?
You need to remove the ICP and connect an air hose to a fitting that screws into the ICP hole and ground the regulator to see if its working.
What else has been done?
So when you tested you heard hissing air then when you activated the IPR it almost stopped but you could hear a little air?